function toggleLayer(whichLayer) {
	if (document.getElementById) {
		// this is the way the standards work
		var style2 = document.getElementById(whichLayer).style;

	} else if (document.all) {
		// this is the way old msie versions work
		var style2 = document.all[whichLayer].style;
	} else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
	}
	if (style2.display == "none") {
		style2.display = "block";
	} else {
		style2.display = "none";
	}
//	var switcher = style2.display ? "none":"block";
//	style2.display = switcher;
//	alert('toggling ' + whichLayer + '\nswitch: ' + switcher);
}